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Share-Based Compensation - Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Number of Shares
Number of Shares, Outstanding Beginning Balance, (in shares)	4,817	5,156	5,164
Number of Shares, Granted, (in shares)	432	824	846
Number of Shares, Exercised, (in shares)	(1,126)	(1,113)	(827)
Number of Shares, Forfeited, (in shares)	(31)	(50)	(27)
Number of Shares, Outstanding Ending Balance, (in shares)	4,092	4,817	5,156
Number of Shares, Exercisable at December 31, (in shares)	2,357
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding (in dollar per share)	$ 107.91	$ 83.64	$ 64.43
Weighted Average Exercise Price, Granted (in dollars per share)	208.21	176.26	147.25
Weighted Average Exercise Price, Exercised (in dollars per share)	66.53	44.80	28.43
Weighted Average Exercise Price, Forfeited (in dollars per share)	158.80	134.83	95.33
Weighted Average Exercise Price, Outstanding (in dollars per share)	129.51	$ 107.91	$ 83.64
Weighted Average Exercise Price, Exercisable at End of the Period (in dollars per share)	$ 100.41
Weighted Average Remaining Contractual Life (Years), Outstanding at Period End	7 years
Weighted Average Remaining Contractual Life (Years), Exercisable at Period End	6 years
Aggregate Intrinsic Value, Outstanding at December 31	$ 240,069
Aggregate Intrinsic Value, Exercisable at December 31	$ 201,349

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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